The sound is very neutral as can be expected with a flat curve. I do find the 2451/2332 combination being very revealing and detailed. Among the best I have heard to date.
The tweeter makes a big difference. It’s a bit funny because the measurements is not that different when comparing only driver with driver/tweeter below 18k. But the combinations do sound very different. The three-way setup is much more pleasing to listen to. The music is more present in the room. -Don’t really understand why. The measures rather similar and the XO is above 10k when using three-way setup.